Update recommended maximum database instances (#30641)

* Update recommended maximum database instances

* Update recommended maximum database instances

* Clarify database recommendation

* Update

* Clean

Author: sethsamuel

layouts/shortcodes/dbm-mysql-agent-config-examples.en.md

@@ -1,6 +1,7 @@
 ### One agent connecting to multiple hosts
 It is common to configure a single Agent host to connect to multiple remote database instances (see [Agent installation architectures](/database_monitoring/architecture/) for DBM). To connect to multiple hosts, create an entry for each host in the MySQL integration config.
-An agent with 4 CPUs and 16GB of RAM can monitor up to 30 databases with the same resources each.
+
+<div class="alert alert-info">Datadog recommends using one Agent to monitor no more than 30 database instances.<br /><br />Benchmarks show that one Agent running on a t4g.medium EC2 instance (2 CPUs and 4GB of RAM) can successfully monitor 30 RDS db.t3.medium instances (2 CPUs and 4GB of RAM).</div>
 
 ```yaml
 init_config:

layouts/shortcodes/dbm-postgres-agent-config-examples.en.md

@@ -1,6 +1,8 @@
 ### One agent connecting to multiple hosts
 It is common to configure a single Agent host to connect to multiple remote database instances (see [Agent installation architectures](/database_monitoring/architecture/) for DBM). To connect to multiple hosts, create an entry for each host in the Postgres integration config.
-An agent with 4 CPUs and 16GB of RAM can monitor up to 30 databases with the same resources each.
+
+<div class="alert alert-info">Datadog recommends using one Agent to monitor no more than 30 database instances.<br /><br />Benchmarks show that one Agent running on a t4g.medium EC2 instance (2 CPUs and 4GB of RAM) can successfully monitor 30 RDS db.t3.medium instances (2 CPUs and 4GB of RAM).</div>
+
 ```yaml
 init_config:
 instances:

layouts/shortcodes/dbm-sqlserver-agent-config-examples.en.md

@@ -121,7 +121,9 @@ instances:
 
 ### One Agent connecting to multiple hosts
 It is common to configure a single Agent host to connect to multiple remote database instances (see [Agent installation architectures][1006] for DBM). To connect to multiple hosts, create an entry for each host in the SQL Server integration config.
-An agent with 4 CPUs and 16GB of RAM can monitor up to 30 databases with the same resources each.
+
+<div class="alert alert-info">Datadog recommends using one Agent to monitor no more than 30 database instances.<br /><br />Benchmarks show that one Agent running on a t4g.medium EC2 instance (2 CPUs and 4GB of RAM) can successfully monitor 30 RDS db.t3.medium instances (2 CPUs and 4GB of RAM).</div>
+
 ```yaml
 init_config:
 instances: